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Q1. A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 37 degrees above the horizontal. If the mass of the box and the books is 40 kg, what is the normal force on box? a. 332 N b. 312 N c. 392 N d. 292 N
Q2. At t=0 a 1.0kg ball is thrown from a tall tower with v= (18i+24j) m/s. what is change U of the ball -Earth system between t=0 and t=6s a (still free fall)?
A heat engine operating between energy reserviors of 119.94 oC, How much energy must this engine extract from the hot reservior to do 1,583.1J of work
What is the number of turns on the coil and what is the magnetic field at the mean radius?
A computer is reading data from a rotating CD-ROM. At a point that is 0.0256 m from the center of the disk, What is the centripetal acceleration at a point that is 0.0779 m from the center of the disc
Would a plucked guitar sting vibrate for a longer time or a shorter time if the instrument had no sounding board? explain.
A 124 balloon carrying a 22 basket is descending with a constant downward velocity of 25.2. A 1stone is thrown from the basket with an initial velocity of 19.9 perpendiculars to the path of the descending balloon.
A high-tension power line composed of aluminum wire with cross-section area 24 x10?6 m2 carries a current of 1100 A. What is the power loss over 50 km of wire
The car drives straight off the edge of a cliff that is 57 m high. The investigator at the scene of the accident notes that the point of impact is 130 m from the base of the cliff.
If a charge of 0.30 C passes through a person's chest in 1.0 s, If this rate of charge transfer persists for 4.4s, how many electrons pass through the chest
Radiation of intensity 1.00 kW/m2 is incident on an area perpendicular to the incoming light. What is the resulting power per unit area now reaching the surface
The membrane that surrounds a certain type of living cell has a surface area of 6.1 x 10-9 m2 and a thickness of 1.3 x 10-8 m. how many such ions are present on the outer surface?
A motorcycle accelerates uniformly from rest and reaches a linear speed of 22.0 m/s in a time of 9.0 s. What is the angular acceleration of each tire
The new EV-1 electric car makes use of storage batteries as its source of energy. Its mass is 1580 kg and it is powered by 29 batteries, Determine the horsepower required for the motor
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